Domestic Long Hair isn't a breed. It's the label used for mixed-ancestry cats with a medium-to-long coat, so you'll see every color and pattern, from tabby and calico to smoke and solid black. Some look like a Maine Coon or Persian without sharing that ancestry. Adults usually weigh between 8 and 15 pounds, though the fur can make them look bigger.
In Manchester, the practical side is the coat. Plan on regular brushing to prevent mats and hairballs, especially around the hindquarters, and expect more loose fur when the seasons turn. Many are adaptable, affectionate and gentle, but some are bold and some are shy, so spend time with a cat before deciding. Most do well in the city's mix of apartments and houses.